Alkamin ester.



UNITED STATES PATENT OFFICE.

FRIEDRICH STOLZ AND GEORG K'ORNDURFER, OF HOOHST-ON-THE-MAIN, eEn m Y, AssioNoas TO FARBWERKE VORM. MEISTER LUCIUS & BRUNiNG, OF HOCHST-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY ALKAMIN ESTER.

Specification of Letters Patent.

Patented Aug. 7, 1906. I

Application filed November 29. 1905. Serial No. 289.633.

To all? whom it may concern.- Be it known that we, FRIEDRICH STOLZ, Ph. D., and GEORG KORNDORFE Ph. D.,

chemists, citizens of the Empire of Germany, I

residing at HOchst-on-the-Main, Germany,

have invented new Pharmaceutical Products; and we hereby declare the following to be a specification thereof.

' According tovour researches the new substances-namely, the alkamin esters of ortho-aminobenzoic acid may be obtained, for instance, by reducing the alkamin esters of ortho-nitrobenzoic acid.

Th e alkamin esters of ortho-aminobenzolc acid are colorless compounds, little soluble in water, of-a low melting-point, readily soluble in alcohol, ether, and benzene, and of alkaline reaction on litmus. The said esters form salts readily soluble in water to a neutral solution. On heatingwith acids or alkalies the alkamin esters of orthO-aminobenzoic acid are decomposed with formation of Ortho-amino'benzoic acid and alkamin. These esters have the roperty of producing local anaesthesia, and tiiis property is in their neutral reacting hydrochlorids not associated with any irritating effect.

The 'process of .preparing the said new esters of alkamins may be carried out, for

instance, asfollowsz Ten arts, by weight, of ortho nitrobenzoyldiet ylaminoethanol,

being anoil soluble with difiiculty' inwater and which may be obtained by heating one part of diethylaminoethanol with two parts of ortho-nitrobenzoylchlorid in presence of four parts of benzene are reduced at a moderate temperature with thirteen parts, by weight, of tin and twenty-five 'parts, by

weight, of concentrated hydrochloric acid.

From.' the colorless solution thus, obtained the tin is eliminated by means of hydrogen sulfid, and then on addition of potassium carbonate in excess the ortho-aminobenzoyld-iethylaminoethanol is separated as an oil, which may be shaken out with ether.

' If the ethereal solution is evaporated, the

new ester remains as an oil which solidifies only if kept at a low temperature for a considerable time. It is soluble in water with difliculty, but iseasily soluble in ether, alcohol, and benzene. By heating with alkalies or acids the ester is decomposed while regenerating ortho-aminobenzoic acid simultaneously with idethylaminoethanol. With one equivalent, of hydrochloric acid the ester yields a hydrochlorid readily soluble in water to a neutral reaction and crystallizing from alcohol in colorless crystals melting at 125 to 127 centigrade.

neutral solution which produces local an-- aesthesia without causing any irritation.

2. As anew product, the alkamin ester ortho-aminobenzoyldiethylaminoethanol,being a colorless compound little soluble inwater, very readily soluble in alcohol, ether and benzene, solidifying with difficult}, in the cold and of alkaline reaction on litm'us,when heated with hydrochloric acid or soda-lye it is decomposed into ortho-aminobenzoic acid and. diethylaminoethanol and. it forms a neutral reacting salt with one e uivalent of hydrochloric acid which crysta lizes from absolute alcohol in needles'melting at to 127 .centigrade, the solution of which 15' of anaesthetic action without causing irritation.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

FRIEDRICH STQLZ. GEORG KORNDORFER.

Witnesses:

JEAN GRUND, CARL GRUND. 

